Merge pull request matplotlib#18682 from anntzer/pd

Small API cleanups to plot_directive.

Author: timhoffm

doc/api/next_api_changes/deprecations/18682-AL.rst

@@ -0,0 +1,4 @@
+``sphinext.plot_directive.align``
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+... is deprecated.  Use ``docutils.parsers.rst.directives.images.Image.align``
+instead.

lib/matplotlib/sphinxext/plot_directive.py

@@ -159,7 +159,9 @@
 from matplotlib import _pylab_helpers, cbook
 
 matplotlib.use("agg")
-align = Image.align
+align = cbook.deprecated(
+    "3.4", alternative="docutils.parsers.rst.directives.images.Image.align")(
+        Image.align)
 
 __version__ = 2
 
@@ -191,11 +193,6 @@ def _option_format(arg):
     return directives.choice(arg, ('python', 'doctest'))
 
 
-def _option_align(arg):
-    return directives.choice(arg, ("top", "middle", "bottom", "left", "center",
-                                   "right"))
-
-
 def mark_plot_labels(app, document):
     """
     To make plots referenceable, we need to move the reference from the
@@ -238,7 +235,7 @@ class PlotDirective(Directive):
         'height': directives.length_or_unitless,
         'width': directives.length_or_percentage_or_unitless,
         'scale': directives.nonnegative_int,
-        'align': _option_align,
+        'align': Image.align,
         'class': directives.class_option,
         'include-source': _option_boolean,
         'format': _option_format,
@@ -258,7 +255,6 @@ def run(self):
 
 
 def setup(app):
-    import matplotlib
     setup.app = app
     setup.config = app.config
     setup.confdir = app.confdir